Manufacture of slow-setting cement



UNITED STATES PATEN -T "OFFICE.

FABIO rnm'mm, or noun, ITALY, assrenon 'ro THE contra-iii Bommmr nanomnnrrmo, or noun, ITALY. I j

MANUFACTURE or SLOW-SETTING cnmnnr."

No Drawing.

To all whom it may concern: Be it known that I, FAnIo ject of the King of Italy, and residing at ome, Italy, (whose post-address is Piazza S. S. Apostoli No., l8,) have invented cer tain new and useful Improvements in the,

Manufacture of Slow-Setting Cement, of which the following is a specification.

This invention relates to a slow setting calcareous cement free from the binary calclum compounds of alumina or 1ron generally used, which 1s prepared by convertln an ordinary mixture producing Portlan cement into slag.

Investigation of conditions of equllibrium in the system QaO-A1 O Fe O,-SiO carried out by the applicant, among other things with reference to the constitution of Portland'cement, has proved that for the common centesimal compositions of the said the ordinary proportion generally reverse considerable of that mentioned above) quantities of aluminates and ferrite of calcium, are completely converted into ternary silicates (of the form 2CaO.Al O .SiO 2CaO.Fe,O .2SiO which are not decomposed by water and by saline solutions (such as chlorids, sulfates, etc.).-

Disappearance of the above mentioned binary compounds is practically produced wthen Fe O and A1 0 are in the proportion 0 1:1.

For each composition the fixed values of corresponding to and of SiO Al,,O,,-l-Fe,,0

Specification of Letters Patent.

vof the proportion, to the value 1 Patented Mar. 22,1921.

Application filed August 23, 1920. Serial No. 405,416. I.

F6 0, and A1 0, the fusibility 6f the mix- FERRARI, a subture regularly sinks, (owing to the tendency 59.8 d

102.2 an thus reaches its maximum value.

Finally, the formation of ternary silicates of the above described type makes it possible, by suppressing that of inactive binary silicates; to obtain the maximum production of the essential hydraulite.

' The above mentioned facts make it pos sible to establish t hat anagglomerant, the

composition'of'which corresponds to well determined values of and of SiO , 11,0, +Fe,o,

'equal to an ordinary Portland cement, but

containingoxids Fe O and A1 0 in the proportion of their equivalents, must, as v compared with the said cement: (1) require for its formation a smaller consumption of fuel; (2) contain a'greater proporcompose under the action of sea water or sulfated water generally.

The applicant prepares the product in question by using ordinary materials (lime- -tion of the essential hydraulity; (3) not destone and clay) used in the manufacture of Portland cement. By suitable additions of silicious sand and of iron oxid, he raises his raw mixtures to the values corresponding to the well fixed values of CaO, SiO A150,, Fe O and of SiO KLO, Fe,O

startin from the ordinary proportion between W 0 and A1 0 comprised between 1 and 1.563.

If the burning is carried out in accordance with the ordinary methods (fixed or rotary kiln) a slow setting product is obtained which replaces advantageously and g economically Portland cement. starting from the ordinary portion between Having now particularly described and ascertained the nature of the said invention F50 and M 0 is comprised between 1 1C and in What manner the same is to be perand 1.563. formed, I declare that What I claim is In testimony whereof I have hereunto A slow setting calcareous cement free signed my name in the presence of two witfi'om binary calcium compounds of alumina nesses.

or iron generally used, which is prepared FABIO FERRARI. by converting into slag a raw mlxture of the W itnesses: ordinary type used for Portland cement, in GU10 CLMPANELLI,

which the proportion between the oxide DUILIO NABDENI. 

